CURRENT PROPAGATION CONDITIONS.: Solar-terrestrial indices for 24 May follow. Solar flux 78 and estimated planetary A-index 4. The estimated planetary K-index at 0300 UTC on 25 May was 0. No space weather storms were observed for the past 24 hours. No space weather storms are predicted for the next 24 hours.

ALERT CONDITION: WHISKY ( WHITE )

Thursday, May 25, 2017 - 04:46 GMT - UPDATE # 10

OPERATIONAL FORECAST. - GEOMAGNETIC FIELD. The geomagnetic field is expected to be at quiet conditions on day one (25 May). Unsettled to active conditions are expected, with a slight chance for G1-Minor storm conditions, by midday on day two (26 May), with the arrival of the 23 May CME. Unsettled to active conditions are expected to continue on day three (27 May) with CME conditions persisting. .- SOLAR ACTIVITY. Solar activity is expected to be very low, with a slight chance for C-class flares, throughout the forecast period (25-27 May).

G/S/R SCALES USED     DEF'S USED     LIGHTNING - (QRN)


HF OPERATIONAL BRIEFING - CURRENT CONDITIONS IN DETAIL

CURRENT SOLAR CONDITIONS


VISIBLE DISK

 


SOLAR MAGNETOGRAM

 


NEAR INFRARED

 


SUNSPOT TRACKING

 

Solar activity remained very low. Region 2659 (N12W18, Cro/beta) remained the only spotted region on the disk. No Earth-directed CMEs were observed during the summary period.


RADIO BLACKOUTS - SOLAR STORMS - GEOMAGNETIC STORMS

The geomagnetic field was quiet.


"D" LAYER - HF ATTENUATION LEVELS


AURORA  -   NORTH POLE  - SHORT PATH